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0
votes
3answers
122 views

Sanyo battery: what 430MH stands for?

I have a SANYO NI-MH battery from my Oral-B toothbrush. I reads 430MH. Now I'm curious what does 430MH stand for? Im thinking its probably nickel–metal hydride if ...
2
votes
1answer
93 views

Is there an easy way to protect a PCB from leaked electrolyte?

I've come across a LED flashlight that has rather curious design. The flashlight is rather powerful - it can notably heat up in "turbo" mode and so the driver definitely deals with some serious ...
2
votes
2answers
128 views

Alkaline cells vs. LED flashlight

I have (had, actually) an El Cheapo pocket LED flashlight powered by 3 AAA cells. It was shipped with very low quality "salt" cells (regular, low weight - someone please suggest a proper English name ...
0
votes
2answers
134 views

is a higher voltage battery a more efficient energy deliverer than a lower voltage battery?

a DC electric motor moving a car. will it experience the same torque with current provided from a 4V battery with a capacity of 1000 Ah as with current provided from a 400V battery with a capacity of ...
0
votes
1answer
105 views

relationship between battery voltage and discharge rate

I guess my question roots from me not understanding what a load represents to the battery. Is a 4V battery able to discharge at a higher rate (C rate) than a 2V battery? Or does it completely depend ...
1
vote
2answers
120 views

Best value Lithium ion/polymer cells/batteries

I've built a sound reactive, android controlled, wearable RGB LED matrix/suit which I'm currently powering with a rather heavy 12V 3Ah SLA battery. I'm looking to switch to lithium or ni-mh packs and ...
4
votes
1answer
140 views

The voltage of capacitor across battery never reaches battery voltage

I made some homemade vinegar batteries. The voltage of each cell was measured around 0.45V. I have 18 of them in series and I measured around 6.5V for the whole chain. Since the vinegar batteries ...
5
votes
1answer
264 views

New alkaline batteries with 10-year shelf life—what's changed?

I'm finding that some new alkaline batteries, such as the new Duracell Duralock and Energizer Power Seal batteries, have a shelf life of 10 years. Most other alkaline batteries have a shelf life of 7 ...
2
votes
2answers
282 views

How fast may I trickle charge a full LSD NiMH battery?

I've bought two packages of low-self-discharge nickel-metal hydride AA batteries, each made by a different well-known battery manufacturer. Sadly, the datasheets aren't very detailed: • One ...
4
votes
1answer
456 views

Lithium-ion rechargeable battery, shelf life

For Lithium-ion rechargeable batteries, that have never been charged, or been charged like 2-3 times at most, some 2-3 years back, and having since-then been in packaged condition, what should I ...
3
votes
1answer
88 views

What makes primary batteries leak on very deep discharge?

From my experience, if a primary (alkaline or zink) battery is left in a device with very low consumption (like a remote control, or a quartz watch) then at some point all the energy is drained and ...
2
votes
1answer
160 views

Can a lead-acid battery charger be used for “Gel” type?

I have a PB-600-24 lead acid battery charger. Can I use it for the battery type that has an image as below? 4 of the batteries are in series.
6
votes
1answer
166 views

If I turn a AA around will it drain or damage electronics?

I have an Apple Bluetooth keyboard. The thing turns on all the time when I put it in my backpack. This is bad because it blocks the soft keyboard on my phone. It runs on 2 AA batteries. Lately, I ...
5
votes
3answers
509 views

Why does connecting batteries in series result in doubled current sourcing while shorting?

I have Duracell Ultra Power AAA batteries, current draw is around 2.5A when shorting for single unit. I have just tried connecting them in series and parallel then measure discharge current. ...
2
votes
2answers
172 views

Electrons' flow misconception?

Conductors have a single electron in the last band, these electrons get pushed forward by electrons coming from the source (Battery), each electron pushes its neighbor and so on. Current is the flow ...
15
votes
3answers
3k views

What's the highest theoretical energy density for a chemical battery?

This is more a physics/chemistry/nanotech question, but what's the theoretical best energy density you could get out of a chemical battery (or fuel cell), if you could arrange atoms in any manner you ...